Why are they removing it? – TD Ameritrade: Mobile Trader Review

Many traders use two apps for multiple accounts to have different themes for easily distinguishing trades and clarity. If this app is removed from the App Store, and only a single thinkorswim app remains, then many traders would be forced to either buy another device, or open another account with a different brokerage. The latter is much more practical means of ensuring trades don’t overlap across accounts. The former means loss of business for TD and Chuck. Presumably this is attributed to the Charles Schwab acquisition, along with the loss of chat and shadowtrader. What else will be lost? This has the core traders looking elsewhere. Bare bones traders have Robin Hood to go to, if you scrape these features clean, they will just go to Hood instead.
Review by danimalpanda on TD Ameritrade: Mobile Trader.